The Americans with Disabilities Act. The Americans with Disabilities Act (ADA) requires all businesses that are open to the public or that employ more than 15 people to have premises that are accessible to disabled people. Make sure that you and your landlord are in agreement about who will pay for any needed modifications, such as adding a ramp or widening doorways to accommodate wheelchairs.
https://www.nolo.com/legal-encyclopedia/commercial-lease-basics-29934.html
She may also want to check with the office of the inspector (was it health dept or other?) and find out exactly what is required. For instance, if each of the bathrooms (men’s and women’s) are small and say only have 2 stalls each, can she convert to a single handicapped stall in each? As for the work itself, yes if the doorways have to be widened as well as adding the handicapped accessible stalls, toilets, handrails, sinks, I can see that it could be expensive but I would encourage her to get more quotes and there may be options to purchase used fixtures, such as when another establishment has closed.
She might also want to check out the SBA to see if she qualifies for a loans, especially as a woman owned business.
And it may be that there is such a train wreck of circumstances and provisions that the lease is null and void, but that’s only what a real estate attorney could tell her.
This is what happens when we got a nanny state and people are like “not my yob, mon.”